Effects of freeze-thaw on dynamic mechanical behavior of cement emulsified asphalt composite binder

Cement emulsified asphalt composite binder (simplified as CEACB) is a type of composite binder existed in cement and asphalt mortar (simplified as CA mortar). The effects of freeze-thaw cycles on the dynamic mechanical properties of CEACB were analyzed based on viscoelastic mechanical model and dynamic frequency scanning test. The effects of freeze-thaw cycles, temperatures and mix proportions on the viscoelastic behavior of CEACB were analyzed. This study demonstrates that, as freeze-thaw cycles increasing, constitutive equation parameters E ₁ and η ₁ decrease, and r tends to increase. The ability of CEACB to resist elastic deformation and viscous flow is reduced, and CEACB shows a tendency of softening. With asphalt to cement ratio (A/C) increasing and temperature rising, both E ₁ and η ₁ decrease, while r increases, and CEACB tends to be like viscous material. As freeze-thaw cycles increasing, the pore content of CEACB increases. Freeze-thaw causes obvious structural damage and viscoelastic mechanical properties of CEACB were changed.